4 wounded as US military aircraft takes on fire during evacuation mission in South Sudan

Rebel gunfire hit a U.S. military aircraft trying to evacuate American citizens caught in a remote region of South Sudan that on Saturday became a battle ground between the country's military and renegade troops, officials said. Four U.S. service members were wounded.

The U.S. military aircraft were heading to Bor, the capital of the state of Jonglei and scene of some of the nation's worst violence over the last week. One American service member was reported to be in critical condition.

The U.S. military's Africa Command said the hit aircraft was "participating in a mission to evacuate American citizens in Bor."

"After receiving fire from the ground while approaching the site, the aircraft diverted to an airfield outside the country and aborted the mission," the statement said. "The injured troops are being treated for their wounds."

Two officials told The Associated Press that after the aircraft took incoming fire, they turned around and flew to Kampala, Uganda. From there the service members were flown on to Nairobi, Kenya for medical treatment. The two officials are in East Africa and demanded anonymity to share information not made public.

There were injuries sustained on more than one US Osprey. So there were at least 2 aircraft that took small arms fire. 3 of these injuries were described as non life-threatening and one "serious" injury.

South Sudan's military spokesman, Col. Philip Aguer, said that government troops are not in control of Bor, so the attack on the U.S. aircraft has to be blamed on renegade soldiers, he said.

"Bor is under the control of the forces of Riek Machar," Aguer said.

South Sudan's information minister, Michael Makuei Lueth, said that South Sudanese ground troops, backed by the country's air force, are fighting rebels in Bor, an effort to retake the state capital they lost earlier this week.

"There is fighting going on in Bor town, yes, because since (Saturday) morning they have continued to attack the civilian population," he said, talking about renegade troops. "They have gone as far as not respecting the U.N. compound."

He said fighting started early Saturday after reports came in that rebels there were shooting indiscriminately at civilians.

"The bodies are sprinkled all over the town," he said. No death toll could be estimated, he said.

South Sudan President Kiir, an ethnic Dinka, said this week that an attempted coup triggered the violence now pulsing through South Sudan. He blamed the former vice president, Machar, an ethnic Nuer. But officials have since said a fight between Dinka and Nuer members of the presidential guard triggered the initial violence late Sunday night. Machar's ouster from the country's No. 2 political position earlier this year had stoked ethnic tensions.

The violence has killed hundreds and has world leaders worried that a full-blown civil war could ignite in South Sudan. The south fought a decades-long war with Sudan before a 2005 peace deal resulted in a 2011 referendum that saw South Sudan break away from the north, taking most of the region's oil wealth with it.

Lueth described Machar as "the rebel leader," saying the forces that control Bor believe they are fighting on his behalf. Machar's whereabouts remain unknown, but he has said in recent interviews that he is in hiding somewhere in South Sudan.

An International Crisis Group expert on South Sudan told The Associated Press on Friday that rebels have taken control of at least some of South Sudan's oil fields, an issue that could bring Sudan into the conflict. South Sudan's oil flows north through Sudan's pipelines, providing Khartoum with much needed income.

The U.N. Security Council on Friday said the weeklong violence resulted from a "political dispute among the country's political leaders" that could affect not only South Sudan, but neighboring countries and the entire region.

President Obama earlier this week dispatched U.S. troops to help protect the U.S. Embassy in the capital, Juba. The U.S. Embassy organized at least five emergency evacuation flights to help U.S. citizens leave the country. Other countries like Britain, Germany and Italy also helped citizens evacuate.